System and method for multi-network coverage

ABSTRACT

A system and method are provided for a multi-network wireless communications access terminal (AT) to access multi-network coverage. The method registers a multi-network AT in a first communications network. In response to registering with the first network, the AT receives information via the first network that is required for accessing a second communications network (e.g., an IEEE 802.20 or 1xEV-DO network). The AT obtains services accessed via the second network, in response to the access information received via the first network. For example, the second network access information may be system information, channel information, or access point parameters. The AT retains the option of obtaining services accessed via the first network if the second network cannot be accessing the second network.

FIELD

The present invention generally relates to wireless communications and,more particularly, to a multi-network system and method for accessing afirst wireless communications network using information obtained fromcommunications received via a second network.

BACKGROUND

Traffic on the Internet is growing exponentially due to an increasingnumber of subscribers and the introduction of new applications. Widearea wireless networks are also experiencing rapid subscriber growth.Currently, there are many efforts underway to provide data services onwireless access networks, such as IEEE 802.11 networks. However, theprovision of these high bandwidth data services is not necessarilyconducive to efficient battery consumption, especially if a wirelessaccess terminal (AT) spends long periods of time in the idle state.

Other networks, such as Code Division Multiple Access (CDMA) wirelessphone networks, with low bandwidth data rates, are optimized for pagingservices, supporting long idle and rapid page response times. ATsoperating in these paging-optimized networks consume a minimum ofbattery power.

As the high data rate networks expand, more network coverage overlap isoccurring with the above-mentioned paging-optimized networks.Concurrently, multi-mode ATs are entering the market that are able tocommunicate in both types of networks. While a multi-mode AT has theconvenience of being able to communicate in either type of network, thebattery consumption problem still exists if the AT is used to “camp” onthe high data rate network.

It would be advantageous if an multi-network AT could seamlessly makeuse of the advantages offered by both paging-optimized and high datarate networks by camping on the paging-optimized network, and accessingthe high data rate network only when data communications are required.

It would be advantageous if overlapping networks could cooperate, withthe paging-optimized network providing high data rate network accessinformation for any monitoring multi-network AT.

SUMMARY

To address the above-mentioned problems, a wireless communicationsmulti-network AT is presented that can be registered in a first network,and collect information needed to access a second network, when the needarises. That is, the AT is able to obtain access information for thesecond network without registering in, or monitoring the second network.Likewise, the first network access point (AP) cooperates by detectingthe presence of a second network AP and collects information that isneeded for accessing the second network AP. The first network AP canbroadcast the second network access information via the first network,or supply the access information to an AT upon request.

Accordingly, a method is provided for a multi-network wirelesscommunications AT to access multi-network coverage. The method registersa multi-network AT in a first communications network. In response toregistering with the first network, the AT receives information via thefirst network that is required for accessing a second communicationsnetwork (e.g., an IEEE 802.20, 802.16e, or 1xEV-DO network). The ATobtains services accessed via the second network, in response to theaccess information received via the first network. For example, thesecond network access information may be system information, channelinformation, or access point parameters.

The AT retains the option of obtaining services accessed via the firstnetwork if the second network cannot be accessing the second network.For example, the AT may fail to receive the second network accessinformation, or the access information may be outdated. Alternately, theAT may fail to receive second network services as a result of inadequatesecond network wireless coverage.

If the first network AP does not broadcast the second network accessinformation, the AT may periodically monitor the second network band todetect the presence of the second network. If the second network isdetected, the AT requests the access information from the first networkAP.

In another aspect, a method is provided for a communications network APto supply wireless communications multi-network coverage. The methodprovides a first communications network AP. A second communicationsnetwork AP detects the presence of the first network AP, and ceases tobroadcast access information in response to detecting the first networkAP. The first network AP detects the presence of the second network APand advertises the availability of the second network AP by broadcastingthe information, or supplying the information to ATs upon request.

Additional details of the above-described methods, a multi-network ATfor accessing multi-network coverage, and a system for providingmulti-network coverage are provided below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram of a multi-network wirelesscommunications access terminal (AT) with a system for accessingmulti-network coverage.

FIG. 2 is a schematic block diagram depicting a multi-network wirelesscommunications AT with a processor device for accessing multi-networkcoverage.

FIG. 3 is a block diagram depicting a multi-network AT capable ofaccessing multi-network coverage.

FIG. 4 is a schematic block diagram of a system for providing wirelesscommunications multi-network coverage.

FIG. 5 is a schematic block diagram of a communications network accesspoint (AP) with a processor device for providing wireless communicationsmulti-network coverage.

FIG. 6 is a block diagram depicting a communications network APproviding wireless communications multi-network coverage.

FIG. 7 is a diagram depicting a variation of a mobile IP (MIP)addressing protocol stack.

FIG. 8 is a flowchart illustrating a method for accessing multi-networkcoverage in a multi-network wireless communications AT.

FIG. 9 is a flowchart depicting a method for providing wirelesscommunications multi-network coverage in a communications network AP.

DETAILED DESCRIPTION

Various embodiments are now described with reference to the drawings. Inthe following description, for purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of one or more aspects. It may be evident, however, thatsuch embodiment(s) may be practiced without these specific details. Inother instances, well-known structures and devices are shown in blockdiagram form in order to facilitate describing these embodiments.

As used in this application, the terms “component,” “module,” “system,”and the like are intended to refer to a computer-related entity, eitherhardware, firmware, a combination of hardware and software, software, orsoftware in execution. For example, a component may be, but is notlimited to being, a process running on a processor, a processor, anobject, an executable, a thread of execution, a program, and/or acomputer. By way of illustration, both an application running on acomputing device and the computing device can be a component. One ormore components can reside within a process and/or thread of executionand a component may be localized on one computer and/or distributedbetween two or more computers. In addition, these components can executefrom various computer readable media having various data structuresstored thereon. The components may communicate by way of local and/orremote processes such as in accordance with a signal having one or moredata packets (e.g., data from one component interacting with anothercomponent in a local system, distributed system, and/or across a networksuch as the Internet with other systems by way of the signal).

Various embodiments will be presented in terms of systems that mayinclude a number of components, modules, and the like. It is to beunderstood and appreciated that the various systems may includeadditional components, modules, etc. and/or may not include all of thecomponents, modules etc. discussed in connection with the figures. Acombination of these approaches may also be used.

FIG. 1 is a schematic block diagram of a multi-network wirelesscommunications access terminal (AT) 100 with a system for accessingmulti-network coverage. The system 102 comprises a first communicationssubsystem 104 having a wireless interface, represented by antenna 106,for registering the AT 100 in a first communications network 108. Thefirst subsystem 104 typically includes a wireless transceiver (notshown) with frequency translation, de/modulation, and basebandprocessing circuitry. The subsystem 104 has an interface on line 110 tosupply access information received for a second communications network.For example, the first subsystem 104 may be a CDMA, a Global System forMobile Communications (GSM), or a Universal Mobile TelecommunicationsSystem (UMTS) subsystem. The first subsystem 104 is not limited to anyparticular wireless communications protocol, however, for the purposesof this example it is assumed that the first subsystem is apaging-optimized network, which typically has a large coverage area.

An access module 112 has an interface on line 110 to receive accessinformation from the first subsystem 104. The access module 112 has aninterface on line 114 to supply the received access information. Asecond communications subsystem 116 has a wireless interface,represented by antenna 118, for obtaining services accessed via thesecond network 120. The second subsystem 116 uses only the accessinformation received via the interface connected on line 114 to registerwith, and receive services from the second network 120. That is, thesecond subsystem 116 does not initially rely upon access informationpreviously stored in memory, although the information once obtained, maybe stored for later use. Although the second subsystem 116 is notlimited to any particular communication protocol, for the purposes ofthis example it is assumed that the second subsystem is a high data ratesystem, such as those compliant with IEEE 808.20 or IEEE 802.16e, orthose compliant with wireless telephone standards such as DO. Generally,the second network is a network that can only be accessed by an AT usingsome auxiliary information. That is, the AT must acquire some controlchannel information before it can engage in a network registrationprocess. This process reduces the amount of overhead information that isbroadcast, and permits ad hoc network deployments. Again, the secondsubsystem 116 is typically a transceiver with frequency conversion,de/modulation, and baseband processing circuitry.

In one aspect, the first subsystem 104 receives access information forthe second network 120 such as system information, channel information,and access point parameters. As used herein, system information refersto basic system access information, such as the mode and layout of theOSI model physical layer, which may be common to a number of APs. Forexample, in Orthogonal Frequency Division Multiplexing (OFDM) the systeminformation may include the cyclic prefix length, the number of guardcarriers, and the interlace structure. Channel information conveysinformation for a specific channel to be used by an AT. In OFDM forexample, the channel information may include channel hoppinginformation, control channel timing, pilot information, and antennainformation for a particular channel. Access point parameters conveyinformation for a specific AP. For example, AP parameters may include APID, GPS information, and neighbors for a particular AP.

If the second subsystem 116 fails to access to the second network 120,it sends an access failure notice to the access module 112 on line 114.The access module 112 sends an access acquire command to the firstsubsystem on line 110 in response to receiving the access failurenotice. Then, the first subsystem 104 accesses services via the firstnetwork 108 in response to the access acquire command. Note, the firstnetwork 108 may not be able to supply all the services that arenominally available via the second network 120, and the second networkmay not be able to supply all the services available via the firstnetwork. The second subsystem 116 is unable to access (register and/orreceive services) the second network 120, if it fails to receive accessinformation for the second network. For example, the first network 108may be unable to supply second network access information, or theinformation may obsolete or incorrect. The second subsystem 116 may alsofail to receive second network wireless coverage. That is, the secondsubsystem 116 may be blocked or too far away to communicate with APs inthe second network 120.

In another aspect, the second subsystem 116 may detect the presence ofthe second network 120 and send a detection notice to the access module112 on line 114. For example, the second subsystem 116 may periodicallyawaken, or awaken in response to triggering events. The access module112 sends a request command to the first subsystem 104 on line 110 inresponse to receiving the detection notice. Then, the first subsystem104 requests access information for the second network 120, from a firstnetwork access point (AP) 122, in response to the request command. Thefirst subsystem 104 receives access information for the second network120 from the first network AP 122, in response to the request.

The above-mentioned detection mechanism is useful if the AT misses anaccess information broadcast from the first network AP 122, or if thefirst network AP only supplies second network access information uponrequest. In one aspect, the second subsystem 116 detects an identifier(ID) for an AP 124 in the second network 120 and the first subsystem 104requests access information for the second network 120 using the secondnetwork AP 124 identifier (ID) in the request.

In another aspect, the first subsystem wireless interface 106 receivessecond network paging messages from a first network AP 122. The AT 100may not need access information for the second network, for example, ifthe access information is stored in AT memory 126, or if the secondsubsystem 116 is operating in a sleep mode. Then, the AT is able tominimize battery consumption by receiving the second network pages viathe first network, which enable the AT 100 to register in the secondnetwork 120, at the convenience of the AT. It should be understood thatthe AT is typically a mobile device. As such, the AT may acquiredifferent AP's within the first and second networks as it moves.Further, if one network (i.e., the first network) has a wider coveragearea, the AT may acquire different APs in the second network, even if itneed not acquire a different AP in the first network. It should beunderstood that while the components of system 102 are logicallydistinct, in the actual physical implementation of the system thesecomponents may be enabled with the same hardware. For example, the twonetworks 108 and 120 may both be DO networks operating at differentfrequencies, so that subsystems 104 and 116 can be enabled using thesame circuitry in an AT.

FIG. 2 is a schematic block diagram depicting a multi-network wirelesscommunications AT 100 with a processor device for accessingmulti-network coverage. The processor device 150 comprises a firstcommunications subsystem module 152 with an interface on line 154 forregistering the AT 100 in a first communications network. The firstsubsystem module 152 also receives access information for a secondcommunications network. A second communications subsystem module 156 hasan interface on line 158 for obtaining services accessed via the secondnetwork, using the second network access information received via thefirst subsystem module 152. In some aspects, the processor device ofFIG. 2 is the same as the access module of FIG. 1.

FIG. 3 is a block diagram depicting a multi-network AT capable ofaccessing multi-network coverage. The AT 100 comprises a means 180 forregistering a multi-network AT 100 in a first communications network108. The AT 100 comprises a means 182 for receiving access informationfor a second communications network via the first network, in responseto registering with the first network. In addition, the AT 100 includesa means 184 for obtaining services accessed via the second network, inresponse to access information received via the first network.

FIG. 4 is a schematic block diagram of a system for providing wirelesscommunications multi-network coverage. The system 200 comprises a secondaccess point (AP) 124. The second AP 124 includes a first communicationssubsystem 202 with a wireless interface, represented by antenna 204, fordetecting the presence of the first AP 122 operating in the firstcommunications network 108. The first subsystem 202 has an interface online 206 for supplying detection information. The first subsystem 202typically includes a wireless transceiver (not shown) with frequencytranslation, de/modulation, and baseband processing circuitry. Forexample, the first subsystem 202 may be a 1x CDMA, a GSM, or a UMTS basestation. The first subsystem 202 is not limited to any particularwireless communications protocol, however, for the purposes of thisexample it is assumed that the first subsystem is paging-optimizednetwork, which typically covers a large geographic area. In one aspect,the second AP 124 is able to detect the first AP without the use of thefirst subsystem 202, in which case the second AP 124 may be equippedwith only a second subsystem (described below).

A distribution module 208 has an interface on line 206 to receive thedetection information and an interface on line 210 to supply acease-broadcast command. A second communications subsystem 212 has awireless interface, represented by antenna 214, that ceases thebroadcast of second communications network access information inresponse to receiving the cease-broadcast command via the interfaceconnected to the distribution module 208 on line 210. Although thesecond subsystem 212 is not limited to any particular communicationprotocol, for the purposes of this example it is assumed that the secondsubsystem is a high data rate system, such as those compliant with IEEE808.20, or IEEE 802.16e, or other wireless standards such as DO. Again,the second subsystem 212 is typically a transceiver with frequencyconversion, de/modulation, and baseband processing circuitry. Althoughthe second AP 124 may include both first and second subsystems, so thatit is able to communicate in both the first and second networks, for thepurposes of this analysis the second AP 124 is assumed to be primarilyassociated with second network 120. That is, the second AP 124 may bereferred to as a second network AP.

The first AP 122 likewise includes a first communication subsystem 216with a wireless interface, represented by antenna 218, for supplyingsecond network access information in the first network. The accessinformation may be system information, channel information, or accesspoint parameters. The first AP 122 detects the presence of the second AP124 using a second communications network subsystem 220 and wirelessinterface 222. Alternately, the first AP 122 may not have a secondsubsystem, but receive the detection information by some other wirelessor wired communication channel (e.g., LAN), not shown. Then, the firstAP 122 advertises the availability of the second AP 124 via the firstsubsystem 216. Although the first AP 122 may include both first andsecond subsystems, so that it is able to communicate in both the firstand second networks, for the purposes of this analysis the first AP 122is assumed to be primarily associated with first network 108. That is,the first AP 122 may be referred to as a first network AP.

In one aspect, the second AP 124 supplies second network accessinformation to the first AP. The access information can be passedbetween APs via the first network 118, the second network 120, orthrough a wired connection (not shown). In one aspect, the first AP 122broadcasts the access information supplied by the second AP 124 via thefirst subsystem wireless interface 218. In another aspect, the first AP122 only broadcasts the presence of the second AP 124, for example anidentifier for AP 124, and the AT 100 may request further accessinformation for AP 124 by accessing AP 122 via the first subsystemwireless interface 218. In yet another aspect, AP 124 broadcasts anidentifier that the AT 100 uses in its request for information about AP124, when it accesses AP 122. In this aspect, the AP 122 may or may notbe aware that the AT 100 is accessing it to request information about AP124, and may not even be aware of the presence of AP 124. For example,the AT 100 may use a layer 2 tunneling protocol (L2TP) to access AP 124using the identifier broadcast by AP 124, and AP 124 may supply thesecond network access information to the AT 100 via the first AP 122 ina message encapsulated using the same L2TP. In this case, the messagesappear as an IP packet flow to AP 122. In another aspect, the AT 100 mayuse specified layer 2 signaling with AP 122 to acquire the accessinformation.

Independent of the access information, the first AP 122 may broadcast apaging message via the first subsystem wireless interface 218. In thismanner, the second AP 124 is able to register AT 100 via the secondsubsystem wireless interface 214 in response to the paging message.

FIG. 5 is a schematic block diagram of a communications network accesspoint (AP) 124 with a processor device for providing wirelesscommunications multi-network coverage. The processor device 400comprises a first communications subsystem module 402 with an interfaceon line 404 for receiving a signal indicating the detection of a firstcommunications network AP (not shown, see first AT 122 in FIG. 4).

A distribution module 406 supplies a cease-broadcast command on line 408in response to the detection of the first network AP, received in asignal from first subsystem module 402 on line 410. A secondcommunications subsystem module 412 has an interface on line 414 thatsupplies a signal that ceases the broadcast of second communicationsnetwork access information in response to the cease-broadcast commandreceived on line 408. In some aspects, the processor device 400 is thesame as the distribution module shown in FIG. 4.

FIG. 6 is a block diagram depicting a communications network APproviding wireless communications multi-network coverage. The AP (i.e.,the second AP 124 of FIG. 4) comprises a means 450 for a secondcommunications network AP to detect the presence of a firstcommunications network AP. The AP further comprises a means 452 for thesecond network AP to cease broadcasting access information in responseto detecting the first network AP.

FUNCTIONAL DESCRIPTION

The invention described in FIGS. 1 through 6 can be used to efficientlymanage paging and overhead channels. When a first network is present,the second network may not broadcast paging channel or overheadmessages. The AT only listens to first network for informationconcerning the second network. The second network is configured, basedon AT capabilities and policy, to support this mode of paging. That is,the AT “knows” that it is being paged on the first network, but expectsthe access to come on the second network. Additionally, the secondnetwork need not broadcast paging and access information if the firstnetwork is present.

Alternatively, AT may specifically register with the first network toreceive second network pages and access information. This mode ofoperation yields a more efficient version of the paging than isperformed when only the second network is available to page the AT.

As a fallback, the AT may still access the first network for services ifit fails to receive second network access information, or if it is notin a coverage area of the second network. The first network may informthe second network of the registration. In a different aspect, the ATregisters in the first network and the second network separately, wherethe registration in the second network includes an indication to sendpages through the first network. For example, the AT may provide an IPaddress or a similar identifier that is reachable via routing in thefirst network, and through which the second network can address pagepackets. The first network delivers any received packet from the secondnetwork, by paging the AT on the first network. The first network may beunaware that the purpose of the packet is specifically for paging the ATon the second network.

A minimal number of overhead messages (i.e., pages and accessinformation) need be broadcast on second network control channels if thefirst network is present. This reduced overhead minimizes controlchannel interference from adjacent AP's. Only enough information toidentify the second network AP, and dynamic parameters required foraccess, need be broadcast. Neighbor lists, modes of operation, powercontrol information, and the like may only be available via unicastaccess of the second network AP, or via the first network. The AT mayaccess first network to find access parameters for the second networkprior to receiving a page. On a page, the AT can immediately accesseither first or second network, depending on coverage.

Signaling becomes a concern when multiple technologies must communicatewith each other. Signaling originating at the network for a radio accesstechnology (RAT) may be managed in two ways. A first RAT may sendsignaling messages via a second RAT, using a tunnel to encapsulate themessage, for example, L2TP (RFC 3931) for layer 2 signaling. The messagemay arrive at a Home Agent (HA), if mobile IP is used, which forwardsthe signaling as IP packets. Alternatively, an IP, or some equivalentglobal address of the AT known by the first RAT, can also be used as thedestination address for the packets. In one aspect, signaling for a RATis only sent when the AT accesses that particular RAT network. In adifferent aspect, layer 2 signaling via another RAT originating at theAT may be used. For example, the AT may send L2TP over a DO (first)network, to talk to a WiFi (second network) access point.

The general inter-working between the two networks requires that thesecond network detect the presence of the first network, and to decidewhich overhead and paging functions it will continue to perform.Similarly, the first network may be configured to advertise the presenceof the second network. The first network may also perform load balancingand efficient handoff with the second network.

The systems described in FIGS. 1 through 6 may be arranged to support anarrangement of networks, where the AT is able to communicate indifferent networks having complementary strengths. For example, the ATmay be registered with an HA for a number of networks, to receive datasimultaneously over multiple RATs, for the purpose of redundancy.Alternately, the AT may use one network (e.g., a cellular network) forpaging, and a different network (e.g., a wireless LAN) for packetforwarding. In one aspect, the HA manages the use of networks using apredetermined policy. In a different aspect, the AT uses messaging tomanage network use, and to configure the HA device. Further, the HA mayalso be configured to dynamically update how and where packets are sent,based on data traffic received from the AT. For example, paging througha first network may occur as a result of data packets being received atthe HA.

The AT may be configured for listening to only a first network forpaging. When a page is received, the AT may access the network on whichit was paged, access another network, or access multiple networkssimultaneously (for redundancy). The HA may be configured differently,based on AT capabilities and policy, to support each mode of access.

With respect to handoffs, the HA may be configured to forward a packetto multiple RAT networks. A multi-network AT may simultaneously downloadfrom two RAT networks during handoff. The AT may switch to a destinationnetwork, once the same packet is received from both networks, or it mayswitch when it receives a message from the HA in the data stream.

FIG. 7 is a diagram depicting a variation of a mobile IP (MIP)addressing protocol stack. In this figure, a mobile node (MN) is locatedat the AP. A MIP tunnel is created between the HA and the AP (MN) in thefirst network. Although not specifically shown, the second network hasan equivalent protocol stack, with the AT using the second networkMAC/PHY access layers.

FIG. 8 is a flowchart illustrating a method for accessing multi-networkcoverage in a multi-network wireless communications AT. Although themethod is depicted as a sequence of numbered steps for clarity, thenumbering does not necessarily dictate the order of the steps. It shouldbe understood that some of these steps may be skipped, performed inparallel, or performed without the requirement of maintaining a strictorder of sequence. The method starts at Step 500.

Step 502 registers a multi-network AT in a first communications network.Step 504 receives information via the first network that is required foraccessing a second communications network, in response to registeringwith the first network. The access information can be systeminformation, channel information, or access point parameters. Step 506obtains services accessed via the second network, in response to theaccess information received via the first network.

In one aspect, Step 508 fails to access the second network. Then, inStep 510 the AT obtains services accessed via the first network inresponse to not accessing the second network. For example, the AT mayfail to access the second network in Step 508 as a result of failing toreceive access information for the second network, or failing to receive(adequate) second network wireless coverage.

In one aspect, the AT (Step 503 a) detects the presence of the secondnetwork. In Step 503 b the AT requests access information for the secondnetwork, from a first network AP (see first AP 122 in FIG. 4). Then,receiving access information for the second network in Step 504 includesthe AT receiving second network access information from the firstnetwork AP, in response to the request. For example, In Step 503 a theAT may detect an identifier for an AP in the second network (second AP124 in FIG. 4). Then, requesting access information for the secondnetwork in Step 503 b includes the AT using the second network APidentifier in the request.

In another aspect, the AT receives a second network paging message viathe first network in Step 512. In Step 514 the AT accesses the secondnetwork in response to receiving the paging message.

Alternately, the flowchart of FIG. 8 may be understood to represent asignal bearing medium tangibly embodying a program of machine-readableinstructions executable by a digital processing apparatus to performoperations for accessing multi-network coverage in a multi-networkwireless communications AT.

FIG. 9 is a flowchart depicting a method for providing wirelesscommunications multi-network coverage in a communications network AP.The method starts at Step 600. Step 602 provides a first communicationsnetwork AP. In Step 604 a second communications network AP detects thepresence of the first network AP. In Step 606 the second network APceases to broadcast access information in response to detecting thefirst network AP. In Step 608 the first network AP supplies secondnetwork access information, such as system information, channelinformation, and access point parameters.

In one aspect, supplying second network access information in Step 608includes substeps. In Step 608 a the first network AP detects thepresence of the second network AP. In Step 608 b the first network APadvertises the availability of the second network AP.

In one aspect, the second network AP provides second network accessinformation to the first network AP in Step 603. For example, the secondnetwork AP sends a message to the first network AP, encapsulated forlayer 2 signaling. Then, in Step 608 the first network AP supplies theaccess information provided by the second network AP. In another aspect,the first network AP receives a request for second network accessinformation from an AT in Step 607 b. Then, in Step 608 the firstnetwork AP supplies second network access information in response to therequest. In a different aspect, the second network AP broadcasts an APidentifier in Step 607 a and in Step 607 b the first network AP receivesa request for access information for the second network AP referencedwith the AP identifier.

In another aspect, the first network AP broadcasts a paging message forthe second network AP in Step 610. In Step 612 an AT registers with thesecond network AP in response to receiving the paging message.

Alternately, FIG. 9 may be seen as representing a signal bearing mediumtangibly embodying a program of machine-readable instructions executableby a digital processing apparatus to perform operations for providingwireless communications multi-network coverage in a communicationsnetwork AP.

Systems and methods have been provided for an AT to access multi-networkcoverage. The invention permits an AT to enjoy all the servicesassociated with multi-network coverage, while minimizing batteryconsumption and control channel communications. Examples of particularcommunication sequences and uses for the invention have been provided asillustrations. However, the invention is not limited to merely theseexamples. Other variations and embodiments of the invention will occurto those skilled in the art.

What is claimed is:
 1. A method for accessing multi-network coverage,the method comprising: registering a multi-network access terminal (AT)in a first communications network; detecting a second communicationsnetwork based at least in part on an identifier of an access point (AP)in the second communications network; receiving access information basedat least in part on the identifier of the AP in the secondcommunications network via the first communications network, wherein theaccess information is required for accessing the second communicationsnetwork; and obtaining services accessed via the second communicationsnetwork independent from the first communications network based at leastin part on the access information received via the first communicationsnetwork.
 2. The method of claim 1, wherein receiving the accessinformation for the second communications network includes receivingaccess information selected from a group consisting of systeminformation, channel information, and access point parameters.
 3. Themethod of claim 1, further comprising: failing to access the secondcommunications network; and obtaining services accessed via the firstcommunications network in response to not accessing the secondcommunications network.
 4. The method of claim 3, wherein the failing toaccess the second communications network includes failing to access thesecond communications network in response to an action selected from agroup consisting of failing to receive access information for the secondcommunications network and failing to receive second communicationsnetwork wireless coverage.
 5. The method of claim 1, further comprising:requesting the access information for the second communications network,from a first communications network AP, wherein the receiving the accessinformation for the second communications network includes the ATreceiving the access information from the first communications networkAP, based at least in part on the request.
 6. The method of claim 5,wherein the request of the access information for the secondcommunications network includes using the second communications networkAP identifier in the request.
 7. A method for accessing multi-networkcoverage, the method comprising: registering a multi-network accessterminal (AT) in a first communications network; receiving accessinformation for a second communications network via the firstcommunications network; receiving a paging message from the secondcommunications network via the first communications network; accessingthe second communications network independent from the firstcommunications network based at least in part on receiving the accessinformation via the first communications network; and transmitting, bythe multi-network AT, a reply message via the second communicationsnetwork based at least in part on the paging message.
 8. An accessterminal (AT) for accessing multi-network coverage, the AT comprising:an antenna; a first communications subsystem having a wireless interfacefor registering the AT in a first communications network and detecting asecond communications network based at least in part on an identifier ofan access point (AP) in the second communications network, and aninterface to supply access information received via the antenna for thesecond communications network based at least in part on the identifierof the AP in the second communications network; and a secondcommunications subsystem with a wireless interface for obtainingservices accessed via the second communications network independent fromthe first communications network, wherein the second communicationsnetwork is accessed by the second communications subsystem using theaccess information received via an interface connected to the accessmodule.
 9. An apparatus for accessing multi-network coverage, theapparatus comprising: a first communications subsystem module with aninterface for registering the apparatus in a first communicationsnetwork and detecting a second communications network based at least inpart on an identifier of an access point (AP) in the secondcommunications network, and receiving access information for a secondcommunications network based at least in part on the identifier of theAP in the second communications network; and a second communicationssubsystem module with an interface for obtaining services accessed viathe second communications network independent from the firstcommunications network, wherein the second communications subsystemmodule obtains services using the access information received via thefirst subsystem module.
 10. The apparatus of claim 9, wherein the firstsubsystem receives access information for the second communicationsnetwork selected from a group consisting of system information, channelinformation, and access point parameters.
 11. The apparatus of claim 9,further comprising an access module having an interface to receive theaccess information from the first communications subsystem and aninterface to supply the received access information to the secondcommunications subsystem.
 12. The apparatus of claim 11, wherein if thesecond communications subsystem fails to access the secondcommunications network, the second communications subsystem sends anaccess failure notice to the access module; wherein the access module isconfigured to transmit an access acquire command to the firstcommunications subsystem based at least in part on receiving the accessfailure notice, and wherein the first communications subsystem accessesservices via the first communications network based at least in part onthe access acquire command.
 13. The apparatus of claim 12, wherein thesecond communications subsystem fails to access the secondcommunications network based at least in part on an action selected froma group consisting of failing to receive access information for thesecond communications network and failing to receive secondcommunications network wireless coverage.
 14. The apparatus of claim 11,wherein the access module sends a request command to the firstcommunications subsystem in response to receiving the detection notice,and wherein the first communications subsystem requests accessinformation for the second communications network from a firstcommunications network AP in response to the request command, andreceives access information for the second communications network fromthe first communications network AP in response to the request.
 15. Theapparatus of claim 14, wherein the first communications subsystemrequests access information for the second communications network usingthe second communications network AP identifier in the request.
 16. Anapparatus for accessing multi-network coverage, the apparatuscomprising: a first communications subsystem module with an interfacefor: registering the apparatus in a first communications network;receiving access information for a second communications network via thefirst communications network; receiving a paging message from the secondcommunications network via the first communications network; and asecond communications subsystem module with an interface for: accessingthe second communications network independent from the firstcommunications network based at least in part on receiving the accessinformation via the first communications network; and transmitting areply message via the second communications network based at least inpart on the paging message.
 17. An apparatus capable of accessingmulti-network coverage, comprising: means for registering the apparatusin a first communications network; means for detecting a secondcommunications network based at least in part on an identifier of anaccess point (AP) in the second communications network; means forreceiving access information for the second communications network viathe first communications network, the receiving of the accessinformation being based at least in part on registering with the firstcommunications network and the identifier of the AP in the secondcommunications network; and means for obtaining services accessed viathe second communications network independent from the firstcommunications network, based at least in part on the access informationreceived via the first communications network.
 18. A non-transitorycomputer-readable medium encoded with a computer program ofmachine-readable instructions executable to perform operations foraccessing multi-network coverage, the operations comprising: registeringa multi-network access terminal (AT) in a first communications network;detecting a second communications network based at least in part on anidentifier of an access point (AP) in the second communications network;receiving access information for the second communications network basedat least in part on the identifier of the AP in the secondcommunications network via the first communications network; andobtaining services accessed via the second communications networkindependent from the first communications network, based at least inpart on the access information received via the first communicationsnetwork.